/*
* The Alluxio Open Foundation licenses this work under the Apache License, version 2.0
* (the "License"). You may not use this work except in compliance with the License, which is
* available at www.apache.org/licenses/LICENSE-2.0
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
* either express or implied, as more fully set forth in the License.
*
* See the NOTICE file distributed with this work for information regarding copyright ownership.
*/
package alluxio.shell.command;
import alluxio.AlluxioURI;
import alluxio.client.file.FileSystem;
import alluxio.client.file.URIStatus;
import alluxio.exception.AlluxioException;
import org.apache.commons.cli.CommandLine;
import org.apache.commons.cli.Option;
import org.apache.commons.cli.Options;
import java.io.IOException;
import javax.annotation.concurrent.ThreadSafe;
/**
* Tests properties of the path specified in args.
*/
@ThreadSafe
public final class TestCommand extends AbstractShellCommand {
private static final Option DIR_OPTION =
Option.builder("d")
.required(false)
.hasArg(false)
.desc("test whether path is a directory.")
.build();
private static final Option FILE_OPTION =
Option.builder("f")
.required(false)
.hasArg(false)
.desc("test whether path is a file.")
.build();
private static final Option PATH_EXIST_OPTION =
Option.builder("e")
.required(false)
.hasArg(false)
.desc("test whether path exists.")
.build();
private static final Option DIR_NOT_EMPTY_OPTION =
Option.builder("s")
.required(false)
.hasArg(false)
.desc("test whether path is not empty.")
.build();
private static final Option FILE_ZERO_LENGTH_OPTION =
Option.builder("z")
.required(false)
.hasArg(false)
.desc("test whether file is zero length.")
.build();
/**
* @param fs the filesystem of Alluxio
*/
public TestCommand(FileSystem fs) {
super(fs);
}
@Override
public String getCommandName() {
return "test";
}
@Override
public int getNumOfArgs() {
return 1;
}
@Override
public Options getOptions() {
return new Options()
.addOption(DIR_OPTION)
.addOption(FILE_OPTION)
.addOption(PATH_EXIST_OPTION)
.addOption(DIR_NOT_EMPTY_OPTION)
.addOption(FILE_ZERO_LENGTH_OPTION);
}
/**
* Tests whether the path is a directory.
*
* @param status the {@link URIStatus} status as the input of the command
* @return true if the path is a directory or false if it is not a directory
*/
private boolean isDir(URIStatus status) {
return status.isFolder();
}
/**
* Tests whether the path is a file.
*
* @param status the {@link URIStatus} status as the input of the command
* @return true if the path is a file or false if it is not a file
*/
private boolean isFile(URIStatus status) {
return !status.isFolder();
}
/**
* Tests whether the directory is not empty.
*
* @param status the {@link URIStatus} status as the input of the command
* @return true if the directory is not empty or false if it is empty
*/
private boolean isNonEmptyDir(URIStatus status) {
return status.isFolder() && status.getLength() > 0;
}
/**
* Tests whether the file is zero length.
*
* @param status the {@link URIStatus} status as the input of the command
* @return true if the file is zero length or false if it is not zero length
*/
private boolean isZeroLengthFile(URIStatus status) {
return !status.isFolder() && status.getLength() == 0;
}
@Override
public int run(CommandLine cl) throws AlluxioException, IOException {
if (cl.getOptions().length > 1) {
return 1;
}
String[] args = cl.getArgs();
AlluxioURI path = new AlluxioURI(args[0]);
try {
URIStatus status = mFileSystem.getStatus(path);
boolean testResult = false;
if (cl.hasOption("d")) {
if (isDir(status)) {
testResult = true;
}
} else if (cl.hasOption("f")) {
if (isFile(status)) {
testResult = true;
}
} else if (cl.hasOption("e")) {
testResult = true;
} else if (cl.hasOption("s")) {
if (isNonEmptyDir(status)) {
testResult = true;
}
} else if (cl.hasOption("z")) {
if (isZeroLengthFile(status)) {
testResult = true;
}
}
return testResult ? 0 : 1;
} catch (AlluxioException | IOException e) {
return 1;
}
}
@Override
public String getUsage() {
return "test [-d|-f|-e|-s|-z] <path>";
}
@Override
public String getDescription() {
return "Test a property of a path, returning 0 if the property is true, or 1 otherwise."
+ " Specify -d to test whether the path is a directory,"
+ " Specify -f to test whether the path is a file,"
+ " Specify -e to test whether the path exists,"
+ " Specify -s to test whether the directory is not empty,"
+ " Specify -z to test whether the file is zero length,";
}
}